Creating Browser Extensions

Introduction

The book "Building Browser Extensions" (2023) by Matt Frisbie is a modern and practical guide to developing extensions for all major browsers: Chrome, Firefox, Edge, Opera, and Safari. The author, a renowned web technology expert and bestselling author of JavaScript books, offers the reader a complete cycle of creating browser add-ons — from basic concepts to publishing in app stores. The book is aimed at developers already familiar with JavaScript and does not require prior experience in creating extensions.

What the book is about

The book is structured as a sequential practical guide. The first part introduces the architecture of extensions: manifest, background scripts, content scripts, popups, and storage. The author then moves on to advanced topics: working with tabs, bookmarks, history, notifications, context menus, hotkeys, and network requests. Special attention is paid to cross-browser compatibility and the use of polyfills. The second half of the book is dedicated to practical projects: an ad blocker, a password manager, API integration, web developer tools, and even an extension for test automation. The book concludes with a chapter on publishing and monetizing extensions.

Who this book is for

The book is intended for intermediate and advanced web developers proficient in JavaScript and with basic knowledge of HTML/CSS. It will be useful for:

• Frontend developers looking to expand their skills and create useful browser tools.
• Developers who want to automate routine tasks or improve the user experience of their web applications.
• Students and enthusiasts interested in the internal workings of browsers and APIs.
• Those who want to publish their own extension on the Chrome Web Store or Firefox Add-ons.

What the reader will learn

• How extension architecture works: manifest, background and content scripts, popups.
• How to use the Chrome API, Firefox WebExtensions API, and polyfills for cross-browser development.
• How to interact with tabs, bookmarks, history, and storage.
• How to intercept and modify network requests, work with notifications and context menus.
• How to create complex projects: an ad blocker, a password manager, developer tools.
• How to test, debug, and publish extensions in app stores.
• How to monetize extensions and comply with store policies.

Strengths

The book stands out for its practical focus. Each chapter contains ready-made code examples that can be immediately run and modified. The author uses modern JavaScript (ES6+), async functions, and modules, making the code current. Special mention deserves the chapter on cross-browser development — it will help avoid common mistakes when porting extensions. The book is written in a lively, accessible language; complex concepts are explained with simple examples. Each chapter ends with a summary and practical exercises to reinforce the material.

Who it is recommended for

I recommend this book to anyone who wants to learn how to create browser extensions from scratch or systematize existing knowledge. It will be useful both for individual developers and teams planning to release their own add-on. Due to its relevance (2023) and coverage of all modern browsers, the book will remain in demand for several more years. If you already know JavaScript and want to learn how to create useful tools that work directly in the browser — this book is for you.